Linux 3.11-rc3
[cris-mirror.git] / drivers / leds / led-core.c
blobce8921a753a32107b30915f8c2ae2b837310d33d
1 /*
2 * LED Class Core
4 * Copyright 2005-2006 Openedhand Ltd.
6 * Author: Richard Purdie <rpurdie@openedhand.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/module.h>
17 #include <linux/rwsem.h>
18 #include <linux/leds.h>
19 #include "leds.h"
21 DECLARE_RWSEM(leds_list_lock);
22 EXPORT_SYMBOL_GPL(leds_list_lock);
24 LIST_HEAD(leds_list);
25 EXPORT_SYMBOL_GPL(leds_list);
27 static void led_set_software_blink(struct led_classdev *led_cdev,
28 unsigned long delay_on,
29 unsigned long delay_off)
31 int current_brightness;
33 current_brightness = led_get_brightness(led_cdev);
34 if (current_brightness)
35 led_cdev->blink_brightness = current_brightness;
36 if (!led_cdev->blink_brightness)
37 led_cdev->blink_brightness = led_cdev->max_brightness;
39 led_cdev->blink_delay_on = delay_on;
40 led_cdev->blink_delay_off = delay_off;
42 /* never on - don't blink */
43 if (!delay_on)
44 return;
46 /* never off - just set to brightness */
47 if (!delay_off) {
48 __led_set_brightness(led_cdev, led_cdev->blink_brightness);
49 return;
52 mod_timer(&led_cdev->blink_timer, jiffies + 1);
56 static void led_blink_setup(struct led_classdev *led_cdev,
57 unsigned long *delay_on,
58 unsigned long *delay_off)
60 if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
61 led_cdev->blink_set &&
62 !led_cdev->blink_set(led_cdev, delay_on, delay_off))
63 return;
65 /* blink with 1 Hz as default if nothing specified */
66 if (!*delay_on && !*delay_off)
67 *delay_on = *delay_off = 500;
69 led_set_software_blink(led_cdev, *delay_on, *delay_off);
72 void led_blink_set(struct led_classdev *led_cdev,
73 unsigned long *delay_on,
74 unsigned long *delay_off)
76 del_timer_sync(&led_cdev->blink_timer);
78 led_cdev->flags &= ~LED_BLINK_ONESHOT;
79 led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
81 led_blink_setup(led_cdev, delay_on, delay_off);
83 EXPORT_SYMBOL(led_blink_set);
85 void led_blink_set_oneshot(struct led_classdev *led_cdev,
86 unsigned long *delay_on,
87 unsigned long *delay_off,
88 int invert)
90 if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
91 timer_pending(&led_cdev->blink_timer))
92 return;
94 led_cdev->flags |= LED_BLINK_ONESHOT;
95 led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
97 if (invert)
98 led_cdev->flags |= LED_BLINK_INVERT;
99 else
100 led_cdev->flags &= ~LED_BLINK_INVERT;
102 led_blink_setup(led_cdev, delay_on, delay_off);
104 EXPORT_SYMBOL(led_blink_set_oneshot);
106 void led_stop_software_blink(struct led_classdev *led_cdev)
108 del_timer_sync(&led_cdev->blink_timer);
109 led_cdev->blink_delay_on = 0;
110 led_cdev->blink_delay_off = 0;
112 EXPORT_SYMBOL_GPL(led_stop_software_blink);
114 void led_set_brightness(struct led_classdev *led_cdev,
115 enum led_brightness brightness)
117 /* delay brightness setting if need to stop soft-blink timer */
118 if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
119 led_cdev->delayed_set_value = brightness;
120 schedule_work(&led_cdev->set_brightness_work);
121 return;
124 __led_set_brightness(led_cdev, brightness);
126 EXPORT_SYMBOL(led_set_brightness);